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Old 02-15-2010, 03:32 PM   #16
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3-way switch help


Quote:
Originally Posted by HooKooDooKu View Post
I've read the code referenced, and I'm a bit confused by its wording.

With some paraphrasing, here is what I think 200.7 says as it relates to a 3-way switch:
A white insulated conductor can be used as other than the grounded conductor where it "is used for the supply to the switch but not as a return conductor from the switch to the switched outlet."

...

Can someone help decode the "code-speak" that 200.7 is using?
Just to be clear here, I'm not looking for an interpretation of 200.7.

What I'm looking to do is better understand "code speak" and therefore I'm looking for someone to EXPLAIN 200.7 and WHY is says you can (or can not) use the white conductor as a traveler.

As an example of what I'm looking for, a few weeks ago, I though an "outlet" was that thing we plug something into. But in "code speak", what I just described is a "receptical". I recently learned that in "code speak" that an "outlet" can be a receptical or a light fixture.

Here, I'm running into some issues trying to properly understand some of the following words and phrases:

"Supply to the switch"
"return conductor"

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Old 02-15-2010, 03:34 PM   #17
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3-way switch help


Regarding "(white)not as a return conductor from the switch to the switched outlet"

So that you do not have both wires going to the light fixture or to the receptacle (controlled by the switch) being white. Now obviously the neutral must be white.
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Old 02-15-2010, 04:17 PM   #18
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3-way switch help


It makes no reference to being used as a traveller.
The intent of that part of the code as it has been explained to me is that you do not want two white wires connecting to a fixture. You must have a white and a coloured one. It would be black or red in most residential situations.

Also note in the code an 'outlet' is any device that uses power. eg light fixture, fan, receptacle, smoke detector

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